Docking a Renderer(EX9) - how?

can we dock render windows ? copied render nodes are docked by default but I would like to dock render windows arbitrarily.
Alt+drag doesn’t work !

you’re right docking usually works via ALT+dragging windows but this seems to be broken for ex9 renderers. so for now what you could do is position 2 windows exactly on top of each other and they will be docked.

or do some getpatch/setpatch that does the repositioning for you